declare « Var « Javascript Data Type Q&A

1. Declaring a boolean in JavaScript using just var    stackoverflow.com

If I declare a JavaScript boolean variable like this:

var IsLoggedIn;

2. Javascript: is using 'var' to declare variables optional?    stackoverflow.com

Is "var" optional?

myObj = 1;

var myObj = 1;

3. Declaring variables with this or var?    stackoverflow.com

What is the difference between declaring a variable with this or var ?

var foo = 'bar'

this.foo = 'bar'

4. In Javascript, what is the motivation or advantage of using var foo = function foo(i) { ... }?    stackoverflow.com

I see that in the answer of

http://stackoverflow.com/questions/3233582/in-javascript-why-write-var-querystringtohash-function-querystringtohash-qu

var foo = function foo(param) {
  ...
}

5. Is var necessary when declaring Javascript variables?    stackoverflow.com

Possible Duplicate:
Javascript: is using 'var' to declare variables optional?

6. javascript : I can not declare variables with var prefix in context of prototype    stackoverflow.com

Hi I'm giving my sample code as :

function A(){
    var varD = 89
}

A.prototype = {
    varA : 90
    var varC = 91
} ...

7. JS var declaring - Wrong validation due to function problem with variable holding same value    stackoverflow.com

I am doing a Validation for Form "Text input". If the user leaves the input empty, a function is starting to run. If the field is bigger than 1 - so it ...

8. Windows vs Var to declare variable    stackoverflow.com

Possible Duplicate:
Difference between using var and not using var in JavaScript
Should I use window.variable or var?

9. JavaScript: Declaring VAR with 'or' statement    stackoverflow.com

the code is something like this

var $page_products = $page_name == 'products-uninterruptible-power-supply.php' OR 'products-uninterruptible-power-supply-np2031.php';

var $page_products = $page_name == 'products-uninterruptible-power-supply.php' || 'products-uninterruptible-power-supply-np2031.php';